auditor

noun

1. 1

   One who audits bookkeeping accounts.

2. 2

   In many jurisdictions, an elected or appointed public official in charge of the public accounts; a comptroller.

3. 3

   One who audits an academic course; who attends the lectures but does not earn academic credit.

4. 4

   One who listens, typically as a member of an audience.

5. 5

   One trained to perform spiritual guidance procedures.